Search found 2300 matches

by RobC
Wed Oct 17, 2018 9:02 am
Forum: hardware
Topic: Archimedes Mode 23 (high-resolution mono)
Replies: 3
Views: 129

Re: Archimedes Mode 23 (high-resolution mono)

No problem - I remembered that Steve had posted about this in the past so it was easy enough to find them from there.
by RobC
Tue Oct 16, 2018 10:02 pm
Forum: hardware
Topic: Archimedes Mode 23 (high-resolution mono)
Replies: 3
Views: 129

Re: Archimedes Mode 23 (high-resolution mono)

Have a look at this and this.
by RobC
Mon Oct 15, 2018 5:48 pm
Forum: hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 17
Views: 363

Re: Raspberry Pi to 1MHz bus interface

I'd like two if possible please.
by RobC
Mon Oct 15, 2018 9:53 am
Forum: programming
Topic: BBC Mode 2 sprites
Replies: 5
Views: 245

Re: BBC Mode 2 sprites

There's this.

I found Neil Beresford's shell a good starting point when developing my Bomb Jack game in Swift.

If you need something that restores the background as the sprite moves in mode 2, let me know and I'll post my sprite code.
by RobC
Sun Oct 14, 2018 8:20 am
Forum: programming
Topic: Ray Traced Spheres
Replies: 26
Views: 839

Re: Ray Traced Spheres

marcusjambler wrote:
Sat Oct 13, 2018 6:43 pm
And a quick Nula....
Looks great. Have you got the code you used to generate it? I've been thinking of putting together a little animation...
by RobC
Sat Oct 13, 2018 1:31 pm
Forum: software
Topic: Combining sprites in RiscOS
Replies: 4
Views: 224

Re: Combining sprites in RiscOS

I think Ian's suggestion is the simplest but think you can merge sprites with the system sprite area by using *SMerge and then save out the whole area to a file with *SSave.
by RobC
Sat Oct 13, 2018 1:04 pm
Forum: programming
Topic: Ray Traced Spheres
Replies: 26
Views: 839

Re: Ray Traced Spheres

marcusjambler wrote:
Sat Oct 13, 2018 11:46 am
Need help setting B-em up for VideoNula - I cant see any settings in the drop downs
I don't think there are any dropdowns - it just recognises the extra NuLA register addresses at FE22 & FE23.

I'm using v2.2 but I'm not sure which branches the NuLA support is in.
by RobC
Fri Oct 12, 2018 8:43 pm
Forum: upcoming and recent events & exhibitions
Topic: London Show / Saturday 27th October 2018
Replies: 8
Views: 571

Re: London Show / Saturday 27th October 2018

I've fired up my Domesday system tonight and it seems to be working albeit slightly temperamentally. If it's still okay in a couple of weeks, I'll bring it along... If it's okay, my daughter is keen to come along to demonstrate the AB Music Master recorder tutor I picked up recently. It plugs into t...
by RobC
Fri Oct 12, 2018 3:42 pm
Forum: programming
Topic: Ray Traced Spheres
Replies: 26
Views: 839

Re: Ray Traced Spheres

Great thread - must get this running on a Pi co-pro :D I don't have a nULA so someone else would have to do that bit. If you want to develop for VideoNuLA without using the actual hardware, the B-Em and b2 emulators support it. I also still have some boards available for those who want the hardware :D
by RobC
Thu Oct 11, 2018 7:55 pm
Forum: hardware
Topic: How to Health Check My BBC Master (128/512)
Replies: 27
Views: 486

Re: How to Health Check My BBC Master (128/512)

Glad that it's working.

If you desperately need/want the disks, I can knock a set up for a few quid to cover the cost of the floppies.
by RobC
Thu Oct 11, 2018 6:05 pm
Forum: hardware
Topic: Baildon Electronics IDE Interfaces - Replication
Replies: 133
Views: 12608

Re: Baildon Electronics IDE Interfaces - Replication

So the 'dump' would just be data from the output - no addresses Yes - you just read the PAL as a 27C020 and then pass the "ROM" image to the PA software as a binary file. In terms of describing inputs and outputs and giving signal names, I can't remember the syntax, but this is what the PA.exe inst...
by RobC
Thu Oct 11, 2018 1:57 pm
Forum: hardware
Topic: Baildon Electronics IDE Interfaces - Replication
Replies: 133
Views: 12608

Re: Baildon Electronics IDE Interfaces - Replication

@RobC: I've downloaded your pa.exe program. What format of data does it require? Hi Dave, The program isn't mine - it comes from here . It's from his post on reading secured PALs. I built the adapter to read the PAL as an EPROM and then used the PA software to analyse the bin/rom file. The software...
by RobC
Thu Oct 11, 2018 1:47 pm
Forum: hardware
Topic: How to Health Check My BBC Master (128/512)
Replies: 27
Views: 486

Re: How to Health Check My BBC Master (128/512)

One way to test the co-pro without booting into DOS/GEM would be to load the co-processor filing system ROM (CPFS). It's on the cowsarenotpurple website. You're still left with the problem of how to get it onto the machine though (assuming you haven't got an EPROM programmer). To be honest though, i...
by RobC
Wed Oct 10, 2018 8:10 am
Forum: acorn atom
Topic: System 6809 card...
Replies: 5
Views: 205

Re: System 6809 card...

Excellent stuff.

Can't help with the disks but I do have the Flex Adaptation Guide and the sources if you haven't already found them...
by RobC
Mon Oct 08, 2018 9:19 am
Forum: hardware
Topic: How to Health Check My BBC Master (128/512)
Replies: 27
Views: 486

Re: How to Health Check My BBC Master (128/512)

I think the reason it's not reverting to RAM with the AA board removed is that the connectors from the AA board replaced the original jumpers on LK18 and LK19. The jumpers select between RAM and ROMs in the two spare 32KB sockets on the motherboard - there's a detailed explanation in this post . On ...
by RobC
Mon Oct 08, 2018 8:20 am
Forum: hardware
Topic: How to Health Check My BBC Master (128/512)
Replies: 27
Views: 486

Re: How to Health Check My BBC Master (128/512)

was then able to use the boards *HI command to set slot 6 to ram. And then Elite seems to load successfully. Glad that you sorted it - I now remember the *HI and *LO commands! There's also a command to list the ROMs that are installed in the board. It's a very useful bit of hardware and the only do...
by RobC
Sun Oct 07, 2018 4:39 pm
Forum: hardware
Topic: How to Health Check My BBC Master (128/512)
Replies: 27
Views: 486

Re: How to Health Check My BBC Master (128/512)

That extra board looks like a Morley AA ROM board. It allows you to switch between ROMs on the board and sideways RAM under software control. I can't remember the commands at the moment but think the manual is on the web. It probably accounts for Elite giving the "no ram in bank 6" error as it's pro...
by RobC
Fri Oct 05, 2018 4:54 pm
Forum: hardware
Topic: Trackball for BBC Micro
Replies: 9
Views: 210

Re: Trackball for BBC Micro

I have an Atari 2600 trakball that's been converted for Beeb use somewhere in my great stash of stuff. I think it's got a user port connector on it but am not absolutely sure. I don't think I've ever used it. Happy to try to find it and take some photos if it would help. Also, Mike Cook covered inte...
by RobC
Thu Oct 04, 2018 6:59 am
Forum: hardware
Topic: Return to E2P - the Electron Second Processor
Replies: 9
Views: 358

Re: Return to E2P - the Electron Second Processor

My E2P definitely has the daughterboard but I can't remember if it's documented in the article.
by RobC
Wed Oct 03, 2018 9:10 pm
Forum: hardware
Topic: Return to E2P - the Electron Second Processor
Replies: 9
Views: 358

Re: Return to E2P - the Electron Second Processor

I have an original, non-working E2P - it came with the magazine article so I suspect it came from that rather than the later commercial version. I spent some time trying to get it to work a good few years ago and did make some progress using some RAM test programs that were included with it. The one...
by RobC
Wed Oct 03, 2018 1:55 pm
Forum: software: new games
Topic: Prince of Persia
Replies: 119
Views: 6609

Re: Prince of Persia

Just opened the latest RetroGamer and found an interview with Kieran in the Homebrew Heroes section :D =D>
by RobC
Tue Oct 02, 2018 8:32 am
Forum: wanted
Topic: WTD: Acorn SCSI interface podule ROM Upgrade AKA35
Replies: 2
Views: 138

Re: WTD: Acorn SCSI interface podule ROM Upgrade AKA35

Hi Andy,

I can do that for you - I upgraded my own podule some time ago and still have the image.

Might take me a couple of weeks though as I'm a bit busy at the moment.
by RobC
Mon Oct 01, 2018 8:36 pm
Forum: software: other
Topic: Mastering the B
Replies: 3
Views: 198

Re: Mastering the B

Is there anything that can be done to make the B more Master compatible? There is the Integra-B board that adds some (most?) of the Master's functionality to the Beeb. However, I don't think it adds shadow RAM in quite the same way (I have an Integra-B board but it doesn't work :( ). I have wondere...
by RobC
Fri Sep 28, 2018 5:05 pm
Forum: hardware
Topic: Cumana SCI
Replies: 3
Views: 124

Re: Cumana SCI

I think the software for these podules is on Chris's Acorns. However, I have a vague recollection of having issues getting them to work - possibly due to passwords (or an unlock code on the software?). Might be worth checking out the software before you invest too much on cables, particularly the ex...
by RobC
Thu Sep 27, 2018 7:40 am
Forum: hardware
Topic: Atomwide A5000 8MB
Replies: 20
Views: 1061

Re: Atomwide A5000 8MB

On the other hand, Chris' Acorn tells me that the Alpha variant also had 12 MHz memory clock... My Alpha has a 12MHz memory clock and 12MHz-rated MEMC1A and is the same as the stock A540. I overclocked my A540's memory to run at 16MHz by replacing all the zip rams with 60nS parts (still using 12MHz...
by RobC
Mon Sep 24, 2018 8:03 pm
Forum: other vintage computer hardware, software and games
Topic: CRT repair
Replies: 10
Views: 472

Re: CRT repair

I got my CM8833 switches from Donberg.

They have various other switches on their website.
by RobC
Mon Sep 24, 2018 6:11 pm
Forum: hardware
Topic: Question About Graphics Modes
Replies: 36
Views: 760

Re: Question About Graphics Modes

At a guess, they didn't want to break backwards compatibility. Although I suppose they could have had a hardware or software switch to swap between the old and new mode of operation. I don't think there was much of an excuse by the time the Master came out - the PaletteMate was available and, as yo...
by RobC
Fri Sep 21, 2018 11:37 am
Forum: general
Topic: Best Basic Games
Replies: 11
Views: 347

Re: Best Basic Games

I spent a fair bit of time playing a football manager game that I typed in from the Micro User. This would have been 87/88ish as it was before I got a Master. When I got a Master, I started modifying it to show match highlights (like Football manager but in mode 2) using the sprite ROM but never fin...
by RobC
Wed Sep 19, 2018 8:30 pm
Forum: upcoming and recent events & exhibitions
Topic: London Show / Saturday 27th October 2018
Replies: 8
Views: 571

Re: London Show / Saturday 27th October 2018

helpful wrote:
Wed Sep 19, 2018 5:22 pm
A bit of a long shot, but is anyone able to bring along a Domesday system
I could at a push although I think one of my laserdiscs is suffering from bit rot :(
by RobC
Wed Sep 19, 2018 12:22 pm
Forum: projects
Topic: 256 x 256 mode
Replies: 5
Views: 451

Re: 256 x 256 mode

One thing I didn't think of was that, looking at this game on other platforms, they all have a static status area above or below the playfield. In which case, you may want to look up the vertical rupture technique which allows hardware scrolling of one area while keeping another static. This does in...